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Old 02-08-2013, 12:42 PM
the baconator

 

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let's talk brakes

i am hoping someone here can help me out. i apologize in advance this will be fairly long. this problem has me scratching my head.

i bough a 97 drove it almost 1000 miles brakes worked great, went to get it MD inspected, needed to replace the front brake hoses and secure the left brake line. okay no problem. i wind up breaking all the front brake lines at the flare fittings due to rust issues (CT truck). No problem bend and fair new lines, install new lines, install new hoses, bleed brakes, take it for a test drive everything works great no lights, no problems, passes inspection. I park it for about two weeks get tags, yada yada. i hop it it to go somewhere start up the truck brake light on the dash is illuminated, i think building vacuum, vacuum builds (i have a gauge pulls about 26), light stays on. i try to release the e brake (never set it, but maybe something is sticking) light sill on. so i drive it down the road and back brakes feel great good, hard pedal, no fading. I take my trip in it, light still on. okay next week take it on a long trip, light still on, brakes still great. come home i'll fine the cause. bleed the brakes can't open rear bleeders (CT truck), replace rear wheel cylinders. bleed brakes great pedal light still on and now ABS light is on too. maybe a vacuum leak, i tighten up all vacuum lines, all position on HVAC work great, light still on. start it up today ABS light is off driving around the ABS light comes on and then off and then ON again seemingly random.

SO.... where do i go from here? bad wire somewhere grounding itself. bad sensor? bad booster? bad master cylinder? what sensors can illuminate the brake light? the ABS light? what are the reasons the brake light can be illuminated? i can think of low brake fluid - it's full, e brake on it's not, broken line resulting in loss of pressure - no leaks i've found, loss of vacuum - vacuum is great. what are the reasons that the ABS light can illuminate? i can only think of something wrong with the sensor/module.

any thoughts opinions?
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Old 02-08-2013, 12:58 PM
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Terry, PM me an email address.
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Old 02-08-2013, 01:10 PM
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Old 02-08-2013, 01:13 PM
the baconator

 

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got your email going to do some reading

EDIT: thanks
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Old 02-08-2013, 01:29 PM
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Re: let's talk brakes

Had a 97 F450 in shop do exactly the same thing to us. It was the switch under the reservoir.

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Old 02-08-2013, 01:58 PM
the baconator

 

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well matt that looks like a long time consuming task, good thing i have lots of time this weekend. where did it come from. Thanks

kraker - that is one of the things on matt's list
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Old 02-08-2013, 02:04 PM
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Like most everything OBS digital:

http://www.thedieselstop.com/faq/949...e=stjsd10r.htm

Save that link if you don't have it

Last edited by BigFuel; 02-08-2013 at 02:07 PM.
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Old 02-08-2013, 02:15 PM
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Re: let's talk brakes

We have accesses to the Ford site but it's pretty fickle most days. I have to save and copy and other bs to post schematics here.

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Old 02-08-2013, 03:00 PM
Hillbilly Deluxe

 

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Re: let's talk brakes

How about vss (also the abs sensor)? It would also cause these lights to be on.

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Old 02-08-2013, 04:19 PM
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Re: let's talk brakes

Big fuel that site is awesome! Way better than the Ford site at work! Thank you

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